The elderly left subcostal pain, usually consider the respiratory system, circulatory system, motor system, digestive system and other aspects of disease. 1. Respiratory system: if the left side of bronchopneumonia, tuberculosis and other respiratory diseases, the patient’s left subcostal pain at the same time will be combined with dyspnea, coughing and sputum and other symptoms. 2. Circulatory system: if the patient suffers from coronary heart disease, angina pectoris and other heart diseases, there is a possibility of pain radiating from the sternum to the lower left rib. 3. Exercise system: The left side of the ribs, intercostal muscle injury or aseptic inflammation of the costal cartilage, minor fracture, etc. caused by prolonged chronic strain may lead to hidden pain when the patient exerts himself/herself. 4. Digestive system: if there are gastritis, pancreatitis and other basic diseases of the digestive system, there may also be hidden pain below the left rib cage. In short, there are many reasons for hidden pain below the left rib cage, and it is necessary to consult a doctor in time to make a clear diagnosis, and then take targeted measures to control the development of the disease.